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Cheap flights from Chicago (CHI) to Seattle (BFI)

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0 Children (2~11)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
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Cheap flights from Chicago to Seattle in January , February 2026

25 Jan - 28 Feb $ 940.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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25 Jan - 21 Feb $ 940.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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25 Jan - 07 Feb $ 960.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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Last minute flights from Chicago to Seattle

28 Jan - 02 Feb $ 967.00
CHI
Chicago
Spirit Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Spirit Airlines
3 STOPS
CHI
Chicago
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25 Jan - 02 Feb $ 991.00
CHI
Chicago
Spirit Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Spirit Airlines
3 STOPS
CHI
Chicago
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25 Jan - 02 Feb $ 1,070.00
CHI
Chicago
Frontier Airlines
2 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
CHI
Chicago
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One-way flights to Seattle from Chicago

2:18 PM - 2:45 PM
Air Excursions
3 Stops
27h 17m
CHI - BFI
$ 479
Kiwi
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3:22 PM - 2:45 PM
Air Excursions
3 Stops
26h 13m
CHI - BFI
$ 501
Kiwi
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9:38 PM - 2:45 PM
Air Excursions
2 Stops
19h 57m
CHI - BFI
$ 502
Kiwi
Pick dates

How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)

Related info for your journey
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How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Chicago (CHI) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.